69 research outputs found
Milho inteiro e moído em diferentes sistemas de alimentação para poedeiras semipesadas
THE RATE OF BINARY BLACK HOLE MERGERS INFERRED FROM ADVANCED LIGO OBSERVATIONS SURROUNDING GW150914
A transient gravitational-wave signal, GW150914, was identi
fi
ed in the twin Advanced LIGO detectors on 2015
September 2015 at 09:50:45 UTC. To asse
ss the implications of this discovery,
the detectors remained in operation with
unchanged con
fi
gurations over a period of 39 days around the time of t
he signal. At the detection statistic threshold
corresponding to that observed for GW150914, our search of the 16 days of simultaneous two-detector observational
data is estimated to have a false-alarm rate
(
FAR
)
of
<
́
--
4.9 10 yr
61
, yielding a
p
-value for GW150914 of
<
́
-
210
7
. Parameter estimation follo
w-up on this trigger identi
fi
es its source as a binary black hole
(
BBH
)
merger
with component masses
(
)(
)
=
-
+
-
+
mm
M
,36,29
12
4
5
4
4
at redshift
=
-
+
z
0.09
0.04
0.03
(
median and 90% credible range
)
.
Here, we report on the constraints these observations place on the rate of BBH coalescences. Considering only
GW150914, assuming that all BBHs in the universe have the same masses and spins as this event, imposing a search
FAR threshold of 1 per 100 years, and assuming that the BBH merger rate is constant in the comoving frame, we infer a
90% credible range of merger rates between
–
--
2
53 Gpc yr
31
(
comoving frame
)
. Incorporating all search triggers that
pass a much lower threshold while accounting for the uncerta
inty in the astrophysical origin of each trigger, we estimate
a higher rate, ranging from
–
--
13 600 Gpc yr
31
depending on assumptions about the BBH mass distribution. All
together, our various rate estimat
es fall in the conservative range
–
--
2
600 Gpc yr
31
Autoradiographic studies of unscheduled DNA synthesis in the germ cells of male mice treated in vivo with MMS and X-rays
Recommended from our members
Health effects workshop summary. [Carcinogenic and mutagenic effects of chlorination of water supplies]
Cancer is a very serious health problem in the United States and a large fraction of human cancer is of environmental origin. The epidemiological data are presented that suggest that some part of environmental cancer is due to substances present in chlorinated water supplies. A number of compounds which are carcinogenic in animal model studies are known to be in chlorinated water supplies. So cancer has been identified as a real and not just potential problem in the chlorination of water supplies. Evidence that chemicals found in chlorinated waters are mutagenic, at least in bacterial test systems, is reviewed. This means they have mutagenic potential in higher organisms, including man, and that increased testing in mammalian test systems needs to be done. The data presented in this symposium on mutagenicity are interesting and important but they still do not provide the information needed to calculate human genetic risk
Unscheduled DNA synthesis in the germ cells of male mice treated in vivo with chemical mutagens requiring metabolic activation
Increased dominant-lethal effects due to prolonged exposure of mice to inhaled ethylene oxide
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